<template>
  <el-container>
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/img/userPic.jpg"
             alt="">
        <span>电商管理系统</span>
      </div>
      <el-button type="info"
                 @click="loginOut">退出</el-button>
    </el-header>
    <!-- 页面主题区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 折叠效果区域 -->
        <div class="toggle_button">
          <i :class="iconCollapse"
             @click="toggleCollapse"></i>
        </div>
        <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#333744"
                 text-color="#fff"
                 active-text-color="#409eff"
                 :collapse="isCollapse"
                 :collapse-transition="false"
                 :router="true"
                 :default-active="activePath"
                 :unique-opened="true">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''"
                      v-for="item in menuList"
                      :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconList[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + itemChild.path + ''"
                          v-for="itemChild in item.children"
                          @click="saveNavState('/' + itemChild.path)"
                          :key="itemChild.id">
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{itemChild.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右边内容区域 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menuList: [],
      iconList: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 折叠图标是否发生变化
      iconCollapse: 'el-icon-s-fold',
      // 保存激活链接
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    loginOut () {
      // 清空所有sessionStorage
      window.sessionStorage.clear()
      // 清空token
      // window.sessionStorage.removeItem('token')
      // 跳转到登录页
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
      console.log(res)
    },
    // 点击收缩图标 切换菜单折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
      if (this.isCollapse) {
        this.iconCollapse = 'el-icon-s-unfold'
      } else {
        this.iconCollapse = 'el-icon-s-fold'
      }
    },
    // 保存连接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
    }
  }
}
</script>

<style lang="less" scoped>
.el-container {
  height: 100%;
  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    div {
      display: flex;
      align-items: center;
      img {
        width: 60px;
        height: 60px;
        border-radius: 50%;
      }
      span {
        margin-left: 15px;
      }
    }
  }
  .el-aside {
    height: 100%;
    background-color: #333744;
    .el-menu {
      border-right: none;
    }
  }
  .el-main {
    background-color: #eaedf1;
  }
  .iconfont {
    margin-right: 10px;
  }
  .toggle_button {
    background-color: #4a5064;
    line-height: 24px;
    color: #fff;
    text-align: center;
    i {
      cursor: pointer;
    }
  }
}
</style>
